Cook the rice according to packet instructions then drain and set aside. Pat the prawns dry on kitchen paper.
In a small bowl mix the tomato puree, chilli flakes, vinegar, honey, sesame oil and tamari or soy sauce.
Heat a wok over a high heat and add the oil, beans, onion, garlic and ginger. Stir fry for 30 seconds, then add the prawns and fry for a further minute.
Tip in the tomato puree mixture and fry for 2 more minutes until everything is nicely coated and the prawns are cooked through.
Divide the rice between two bowls and top with the prawns and beans. Sprinkle with sesame seeds to serve.